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System and method for estimating power consumption of electric apparatus, and abnormality alarm system utilizing the same

  • US 20030093390A1
  • Filed: 10/08/2002
  • Published: 05/15/2003
  • Est. Priority Date: 04/12/2000
  • Status: Active Grant
First Claim
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1. A method for estimating individual electricity consumption of a plurality of electric appliances used by a user, said method comprising:

  • obtaining fundamental and higher harmonics of total load current and their phase differences from voltage obtained from said total load current and voltage measured in a vicinity of a service entrance into said user; and

    estimating electric appliances in operation and individual electricity consumption of said electric appliances from said fundamental and higher harmonics of said total load current and said their phase differences from voltage.

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